CMake: Partially revert recent missing headers commit

The header which was put to the CMake project is not by any means used
during compilation, it is only used when manually updating CUDA wrangler
from CUDA headers.

extern/cuew/CMakeLists.txt

@@ -36,7 +36,6 @@ set(SRC
 	src/cuew.c
 
 	include/cuew.h
-	auto/stdlib.h
 )
 
 blender_add_lib(extern_cuew "${SRC}" "${INC}" "${INC_SYS}")